TRAVIE MCCOY

NEW POLITICS

It's not politics as usual for the Danish threesome – they're ready to rock! Singer David Boyd and drummer Louis Vecchio jump for joy, while guitarist Soren Hansen puckers up under, er, next to, the mistletoe.

BECKY G

STEPHANIE PRATT

'Tis the season to keep the peace. The holiday-ready star of The Hills told PEOPLE she's reunited with her once-estranged brother Spencer. "He's become humble. The experience of the last two years – of losing his fame and spending all his money – has made him grow up. I have my big brother again," she explained at the concert.

ARIANA GRANDE

AUSTIN MAHONE

"WHOS EXCITED FOR JINGLE BALL TONIGHT?!?" the singer Tweeted the day of the big event (obviously he was!). Back to singing in time for the holidays, Mahone also shows off his fancy footwork in the photo booth.